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      12-12-2007, 01:00 PM   #17
Private First Class

Drives: E90
Join Date: Aug 2007
Location: Leeds, GB

iTrader: (0)

Originally Posted by footie View Post
I understood that the MTM supercharged RS4 had it's CR reduced, was this not the case?

I think a good indicator of what is achievable as far as compression ratios and FI you should look at the Audi S6 and RS6 engine. In the S6 it's CR is 12.5:1 but with the RS6 it drops to 10.5:1, I would reckon much over this would cause problems long term and in any case you will have to lose that almighty rev range into the bargain.

I am still a little doubtful over the claimed improvements that have been achieved from such small alterations.

If you can't believe a longstanding BMW engineer (Karl-Otto Noelle) based in the same tiny Bavarian village as Alpina, who can you trust?